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### 18 Cards in this Set

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 temperature =energy of motion of atoms/molecules of an object absolute zero=temp at which all motion ceases. (0 K, -273 C, -459 F) wavelegnth legnth over which wave repeats in pattern (meters) frequency how often the wave repeats itself (cycles per second) speed= wavelegnth times frequency electromagnetic spectrum radio, infrared, visible, ultraviolet, x-ray, gamma ray (left to right) frequency increases, wavelegnth decreases the hotter the object.. -> higher temp -> faster the particles move -> more energy they radiate (more intensely it radiates energy) blackbody curve =distribution of reemitted radiation; in steady state, (when T is contant), blackbody must reemit same amount of energy it absorbs curve shifts toward higher frequencies (shorter wavelegnths) and greater intensities as the object's temp increases stefan-boltzmann law intensity of light is directly related to temp of the object to the fourth power intensity= T^4 wien's law wavelegnth of peak emission= 1/T the hotter an object, the bluer its radiation/ the shorter its wavelegnth continuous spectra covers full range of wavelegnths rainbow running from red to violet w/out interruption. emission spectra pattern of spectral emission lines that represent emission at only certain wavelengths hot,low density gas absorption spectra certain wavelegnths missing; dar lines in otherwise continuous bright spectrum, where light w/in 1 narrow frequency range has been removed cool, low density gas model of atom nucleus=core protons=positive; # determines what element it is neutrons=neutral; # determines what isotope the element is electrons=negative; orbit the nucleus why movement of electrons around nucleus cause atom to absorb/emit enegery? 1.opposites attract 2.discrete levels; different electrons have different allowed electron levels. closest are in ground state 3.discrete energy levels 4.when electron absorbs enough energy, can pull away- ion energy levels if low energy photon strikes electron, it is absorbed and electron jumps up 1 level higher energy photon will cause electron to jump 2 levels higher energy of photon=higher jump electron in higher levels= excited (but wants to go back into ground state) hydrogen spectra hydrogen= most abundant element in universe; simplest atom lyman series:91-122 nm (UV) balmer series:365-656 nm (visible and UV) paschen series:820-1875 nm (IR) doppler effect observer in front of source: shorter wavelegnths, blueshifted observer in back of source: longer wavelegnths, redshifted blueshift/redshift blueshift: shift towards blue (shorter wavelegnths)due to object moving towards us redshift: shift towards red end of spectrum (longer wavelengths)